Abstract
Metabolites, such as volatile fatty acids (VFA: acetic acid, propionic acid, butyric acid) and acetone produced by rumen fermentation, were intravenously infused into the jugular vein of goats during feeding to explore the mechanism and roles of these compounds in ruminating behavior (number of boli and ruminating time). Four female goats were confined in metabolism cages with a stanchion. The ruminating behavior, measured by the number of ruminations, ruminating time, and number of remastications, decreased ( P < 0.05) with an infusion of acetic acid and butyric acid. Propionic acid and acetone infusion, however, increased ( P < 0.05) the ruminating behavior. Acetic acid, butyric acid, propionic acid and acetone influenced ruminating behavior significantly, and therefore, the data suggest that rumination receptors sensitive to VFA and acetone are more likely to be in an area such as the brain stem where they can respond to blood metabolite levels.
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